Hmmmmh - I don't think so. To be an economist, you need an other hobby, like golfing aso - nothing w/ tractor. Or you must buy them and put them in a storage - and then hope for the rising of the value...

Now, has anyone repowered a Case with a Kohler M18? I have a good one sitting in a Snapper LT.

Challenges?

I think they're a pretty straightforward swap... The mounting pattern is the same, and I think the crankshaft height and diameter are the same. Your biggest concern is mounting the pump ---I supect it's a standard hole pattern... also, I have an Onan pump mount for a 446 that I'll sell cheap if you're interested....